• International Journal of Industrial Entomology and Biomaterials
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• v.46 no.1
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• pp.9-15
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• 2023

Recently, a silkworm strain (tentatively named Sericinjam) producing 100% sericin cocoons has been studied in South Korea. In this preliminary study, the crystallinity, mechanical properties, and dissolution conditions of sericin from Sericinjam cocoons were examined. The Sericinjam cocoon could be dissolved in water at high temperature (120℃) and high pressure (HTHP method) in an autoclave and in a CaCl₂/H₂O/EtOH mixture (ternary solvent method), resulting in 82% and 97% dissolution after 30 min, respectively. The solution viscosity of the silk sericin formic acid (SSFA) solution obtained from sericin extracted using the ternary solvent method was higher than that obtained using the HTHP method; however, SSFA solutions obtained from sericin extracted from conventional Baekokjam cocoons yielded a higher solution viscosity. The crystallinity and breaking strength of the sericin film from Sericinjam cocoons were slightly lower, respectively, than those from Baekokjam cocoons. In contrast, the elongation at break of the Sericinjam sericin film obtained using the HTHP method was higher than that of the Baekokjam sericin film.

• International Journal of Industrial Entomology and Biomaterials
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• v.19 no.2
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• pp.255-258
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• 2009

Structure and Properties of sericinjam sericin extracted was investigated using SDS-PAGE electrophoresis, UV, CD, and DSC. The molecular weight and its distribution of sericinjam sericin showed broad tailing pattern. Circular dichlroism spectra showed that the structure of sericinjam sericin in solution was different with domestic one. However, differential thermal calorimetric properties are similar to each other.

• International Journal of Industrial Entomology and Biomaterials
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• v.18 no.2
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• pp.121-124
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• 2009

We investigated sericin extracted from sericinjam, which was inbred at National Academy of Agricultural Science, Suwon, Korea. Sericinjam sericin is composed of 5 fractions: 250 kDa, 120 kDa, 90 kDa, 70 kDa and 40 kDa. Amino acid analysis showed that the major amino acids of sericinjam sericin were Ser, Gly, Asp, Glu, Thr and Ala. Infrared spectra showed that sericinjam sericin has $\beta$-sheet structure. Thermal property of sericin was investigated using DSC and then they showed characteristic degradation peak at around $215{\sim}240^{\circ}C$.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.39 no.1
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• pp.9-17
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• 2013

We studied the anti-oxidant and anti-aging activities of Sericinjam Gland Hydrolysate (SJGH) in the human dermal fibroblasts. SJGH effectively defended cell death and ROS generation under high H2O2 in human dermal fibroblasts. Moreover SJGH reduced the expression of SA-${\beta}$-Gal and MMP-1 under low concentration of $H_2O_2$ whereas biosynthesis of procollagen-I was increased. This results demonstrate the anti-oxidant and anti-aging activities of SJGH. SJGH could be a good candidate for anti-aging cosmetics ingredient.